I would be surprised to see that, especially since the Voices of the Beard show (night 1 of Morsefest in 2018) had poor attendance, so I am not sure Neal wants to risk doing Spock's both nights and risk a disappointing turn-out. Sure, the whole Spock's Beard might be more of an allure than just the three singers, but I doubt enough to make a big difference.
Who knows. I think if they/Neal advertises it right, they could have a huge draw, like with Snow Live.
I think we can safely rule out Transatlantic and Flying Colors, and I don't see Neal wanting to perform any of his other albums in full, considering he skipped most of Lifeline, and any full-album performances of Momentum and The Grand Experiment would seem a bit too recent in my mind, especially since the live albums from those tours cover this albums fairly well.
The only out-of-left-field thing I could think of is if Neal has a new album in the works, be it with the NMB or another solo project like The Exorcist. He has said he's been working on something with Mike involved, as Mike tracked his drums for this "secret project" after he finished tracking drums for TA5 last fall, so *something* is in the works!
I wonder how receptive folks might be to yet-another-band/project featuring Mike and Neal. I keep thinking that it'll end up being a third Cover To Cover album with Randy, especially since the NMB haven't had any covers on their albums outside of MacArthur Park, so the trio of Morse Portnoy George haven't released any covers since 2012, so they may be feeling the itch to release some!
Another wild suggestion I have might be another Yellow Matter Custard reunion. It's been nearly a decade since their last performance together, and there is still a lot of Beatles songs they haven't played yet, or perhaps they could do a few albums in their entirety (The White Album live with Mike, Neal, and Paul would be INSANE to see). But I doubt many Neal fans would turn out for what is essentially a Covers Show, even if it does feature the likes of Paul Gilbert.
Beyond those ideas, I am truly stumped. Maybe Neal will take a year off?
-Marc.